Influence of veneer and cyclic loading on failure behavior of lithium disilicate glass-ceramic molar crowns

Dental Materials : Official Publication of the Academy of Dental Materials
Ke ZhaoPetra C Guess

Abstract

This in vitro study was designed to investigate the influence of the veneer and cyclic loading on the failure behavior of lithium disilicate glass-ceramic (LDG) crowns on maxillary first molar. Sixty-four LDG crowns were divided into 4 groups (n=16). Thirty-two monolithic crowns were fabricated from IPS e.max Press (M), and the remaining bilayered crowns using cut-back technique and conventional manual layering technique from IPS e.max Press/Ceram (B). Monolithic or bilayered crowns were subjected to single-load-to-fracture (SLF) testing using a universal testing machine, before (M1 and B1) and after exposure to sliding-contact fatigue (SCF) testing (M2 and B2), consisting of 1,200,000 mechanical cycles (Fmax=98 N). Data were statistically analyzed using two-by-two factorial design ANOVA. Fractographic analysis was performed to determine the fracture modes of the failed specimens. The mean fracture load values (N±S.D.) for M1, B1, M2 and B2 were 2686±628 N, 1443±327 N, 2133±578 N and 1464±419 N, respectively. Significant differences were found between the failure loads of all groups (P<0.001), except between groups B1 and B2. Bulk fracture initiating from the occlusal surface is the primary failure mode of monolithic and veneer...Continue Reading

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Citations

Jan 19, 2016·Dental Materials : Official Publication of the Academy of Dental Materials·Fatma A ShembishYu Zhang
Mar 12, 2016·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Noor NawaflehFlorian Mack
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Oct 23, 2016·Dental Materials : Official Publication of the Academy of Dental Materials·Haifa El ZhawiYu Zhang
Oct 4, 2016·Dental Materials : Official Publication of the Academy of Dental Materials·Yu-Tao JianKe Zhao
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